The primary objective of the laboratory analysis is to determine if TGF-beta mediates increased asthmatic epithelial susceptibility to RSV infection. The study has three aims which are interrelated: 1) To determine if asthmatic bronchial epithelia express more TGF-beta than normal epithelia; 2) to determine if RSV replication is greater in asthmatic epithelia than normal epithelia; and 3) to determine if TGF-beta mediates asthmatic bronchial epithelial susceptibility to RSV infections.